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Silverback male Mountain Gorilla (Gorilla g. beringei) known as Peanuts, in sub-alpine zone, Virunga Volcanoes, Rwanda, Africa

Mountain Gorillas (Gorilla gorilla beringei), silverback male resting with group, Virunga Volcanoes, Rwanda, Africa

Dark Field Light Micrograph of a male Mosquito (Anopheles sp.), magnification x 65 (if print A4 size: 29.7 cm wide)

Ring-tailed Lemurs (Lemur catta), all white baby male (Sapphire) albino lemur on mother's back, Berenty, Southern Madagascar, Africa

Male Spotted-backed weaver (Village weaver) (Ploceus cucullatus) building a nest, Hluhluwe Game Reserve, South Africa, Africa

Male Spotted-backed weaver (Village weaver) (Ploceus cucullatus) building a nest, Hluhluwe Game Reserve, South Africa, Africa

Male Spotted-backed weaver (Village weaver) (Ploceus cucullatus) building a nest, Hluhluwe Game Reserve, South Africa, Africa

Red hartebeest (Alcelaphus buselaphus) male following a female, Mountain Zebra National Park, South Africa, Africa

Greater kudu (Tragelaphus strepsiceros) buck, Kgalagadi Transfrontier Park, encompassing the former Kalahari Gemsbok National Park, South Africa, Africa

Two gemsbok (South African oryx) (Oryx gazella) fighting, Kgalagadi Transfrontier Park, encompassing the former Kalahari Gemsbok National Park, South Africa, Africa

Young male lion (Panthera leo), Kgalagadi Transfrontier Park, encompassing the former Kalahari Gemsbok National Park, South Africa, Africa

Two gemsbok (South African oryx) (Oryx gazella) fighting, Kgalagadi Transfrontier Park, encompassing the former Kalahari Gemsbok National Park, South Africa, Africa

Greater kudu (Tragelaphus strepsiceros) buck, Kgalagadi Transfrontier Park, encompassing the former Kalahari Gemsbok National Park, South Africa, Africa

Bull elk (Cervus canadensis) along the Madison River, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

Black-browed albatross, Thalassarche melanophris, courtship display on New Island, Falkland Islands, South Atlantic Ocean

South American sea lion bull, Otaria flavescens, attempting to mate on a small islet in the Beagle Channel, Argentina, South America

A pair of upland geese, Chloephaga picta, with goslings on New Island, Falkland Islands, South Atlantic Ocean

Male southern elephant seal pups, Mirounga leonina, mock fighting in Gold Harbour, South Georgia Island, Atlantic Ocean

Male lion (Panthera leo), showing tongue, AfriCat Foundation, Okonjima, Central Namibia, Namibia, Africa

Male Mwanza flat-headed agama (Agama mwanzae), Serengeti National Park, Tanzania, East Africa, Africa

Male Mwanza flat-headed agama (Agama mwanzae), Serengeti National Park, Tanzania, East Africa, Africa

Two blue wildebeest (brindled gnu) (Connochaetes taurinus) bulls fighting, Ngorongoro Crater, Tanzania, East Africa, Africa

Male Impala (Aepyceros melampus) with a Red-Billed Oxpecker (Buphagus erythrorhynchus), Kruger National Park, South Africa, Africa

Male European fiddler crab (Uca tangeri) waving its large right claw, Tavira, Algarve, Portugal, Europe

Northern pintail (Anas acuta) drake, Bosque del Apache National Wildlife Refuge, New Mexico, United States of America, North America

Adult male Chacma baboon (Papio ursinus) eating a water lily tuber, Kruger National Park, South Africa, Africa

Male black wildebeest (white-tailed gnu (Connochaetes gnou) calling, Mountain Zebra National Park, South Africa, Africa

Man with his horse in the valley of Chehel Burj (Forty Towers fortress), Yaklawang province, Bamyan, Afghanistan, Asia

Adult gentoo penguins (Pygoscelis papua) courtship display, Neko Harbor, Antarctica, Southern Ocean, Polar Regions

The male oval squid (Sepioteuthis lessoniana), can reach 14 inches in length, Hawaii, United States of America, Pacific, North America

The male oval squid (Sepioteuthis lessoniana), can reach 14 inches in length, Hawaii, United States of America, Pacific, North America

Adult bull Atlantic walrus (Odobenus rosmarus rosmarus) on the beach in Torellneset, Nordauslandet, Svalbard, Norway, Scandinavia, Europe

Adult bull Atlantic walrus (Odobenus rosmarus rosmarus) hauled out on ice in Storfjorden, Svalbard, Norway, Scandinavia, Europe

Adult Northern (Steller) sea lion (Eumetopias jubatus) bull looking for fish scraps from fishermen in Petersburg, Southeastern Alaska, United States of America, North America

Lyretail anthias (Pseudanthias squamipinnis) close-up of male, Ras Mohammed National Park, off Sharm el-Sheikh, Sinai, Red Sea, Egypt, North Africa, Africa

Male Anhinga (aka Snakebird) a swimming bird of the Darter family, on the Nosara River, Nosara, Guanacaste Province, Costa Rica, Central America

Svalbard reindeer (Rangifer tarandus platyrhynchus) buck in velvet, Spitsbergen, Svalbard Archipelago, Norway, Scandinavia, Europe

African forest elephant (Loxodonta cyclotis) bull standing at the edge of the forest, Loango National Park, Ogooue-Maritime, Gabon, Africa

African forest elephant (Loxodonta cyclotis) bull walking on the beach, Sette-Cama, near Loango National Park, Ogooue-Maritime, Gabon, Africa

African forest elephant (Loxodonta cyclotis) bull standing at the edge of the forest, Loango National Park, Ogooue-Maritime, Gabon, Africa

Male Magnificent Frigatebird (Fregata magnificens) with inflated gular sac, North Seymour Island, Galapagos National Park, Ecuador, South America

Swift fox (Vulpes velox) vixen and kit, Pawnee National Grassland, Colorado, United States of America, North America

A male green iguana on a spiny pochote tree, Nosara, Nicoya Peninsula, Guanacaste Province, Costa Rica, Central America

Polar bear (Ursus maritimus) males playfighting, captive, Highland Wildlife Park, Kingussie, Scotland, United Kingdom, Europe

Southern elephant seal (Mirounga leonina) bull, Gold Harbour, South Georgia, South Atlantic Ocean, Polar Regions

Southern elephant seal (Mirounga leonina) pup, Grytviken Whaling Station, South Georgia, South Atlantic Ocean, Polar Regions

Southern elephant seal (Mirounga leonina) pups, Peggotty Bluff, South Georgia, South Atlantic Ocean, Polar Regions

Antarctic fur seal (Arctocephalus gazella) bulls establishing mating territories at the abandoned Stromness Whaling Station, South Georgia Island, South Atlantic Ocean, Polar Regions

South American sea lion (Otaria flavescens) bull, Seno Agostini Fjord, Strait of Magellan, Patagonia, Chile, South America

South American sea lion (Otaria flavescens) bull, Seno Agostini Fjord, Strait of Magellan, Patagonia, Chile, South America

Breeding pair of Chilean skuas (Stercorarius chilensis), Seno Agostini Fjord, Strait of Magellan, Patagonia, Chile, South America

Flying gurnard (Dactylopterus volitans), one male and one female, Dominica, West Indies, Caribbean, Central America

Pronghorn (Antilocapra americana) buck, Custer State Park, South Dakota, United States of America, North America

White-tailed deer (whitetail deer) (Virginia deer) (Odocoileus virginianus) buck, Custer State Park, South Dakota, United States of America, North America

Pronghorn (Antilocapra americana) buck, Custer State Park, South Dakota, United States of America, North America

Flying gurnard (Dactylopterus volitans), one male and one female, Dominica, West Indies, Caribbean, Central America

Flying gurnard (Dactylopterus volitans), one male and one female, Dominica, West Indies, Caribbean, Central America

Young male keeled skimmer dragonfly (Orthetrum coerulescens), resting on plant stem, Lesbos (Lesvos), Greece, Europe

Santuario do Bom Jesus do Monte (Good Jesus of the Mount Sanctuary), Esplanade, UNESCO World Heritage Site, Tenoes, Braga, Minho, Portugal

Bull moose (Alces alces) calling, Wasatch Mountain State Park, Utah, United States of America, North America

Bighorn sheep (Ovis canadensis) ram during the rut, Arapaho National Forest, Colorado, United States of America, North America

Silverback mountain gorilla (Gorilla gorilla beringei) of the Kwitonda group, Volcanoes National Park, Rwanda, Africa

Mountain gorilla (Gorilla gorilla beringei) silverback of the Umubano group named Charles, Volcanoes National Park, Rwanda, Africa

Male impala (Aepyceros melampus) with a red-billed oxpecker (Buphagus erythrorhynchus), Kruger National Park, South Africa, Africa

Male impala (Aepyceros melampus) with a red-billed oxpecker (Buphagus erythrorhynchus), Kruger National Park, South Africa, Africa

Male mountain bluebird (Sialia currucoides), Mount Evans, Arapaho-Roosevelt National Forest, Colorado, United States of America, North America

A fallow deer stag (Dama dama) rests in a misty and foggy Richmond Park one winter sunrise, Richmond, Greater London, England, United Kingdom, Europe

California gray whale (Eschrichtius robustus) and excited whale watchers, San Ignacio Lagoon, Baja California Sur, Mexico, North America

Heermann's gulls (Larus heermanni) mating, Isla Rasa, Gulf of California (Sea of Cortez), Mexico, North America